//
//  StatusListViewModel.swift
//  SinaWeibo
//
//  Created by liyue on 15/11/21.
//  Copyright © 2015年 李越. All rights reserved.
//

import UIKit
import AFNetworking
import SVProgressHUD
import SDWebImage

class StatusListViewModel: NSObject {

    class func loadData(since_id since_id: Int, max_id: Int, finished: (array: [Status]?) -> ()) {
        
//        let AFN = AFHTTPSessionManager()
        let urlString = "https://api.weibo.com/2/statuses/home_timeline.json"
        guard let token = UserAccountViewModel().token else {
            
            SVProgressHUD.showErrorWithStatus("您暂未登录")
            return
        }
        var parameters = ["access_token": token]
        
        if since_id > 0 {
            
            parameters["since_id"] = "\(since_id)"
        }
        
        if max_id > 0 {
            
            parameters["max_id"] = "\(max_id - 1)"
        }
        
        NetworkTools.sharedTools.requestJsonDict(.GET, urlString: urlString, parmaters: parameters) { (result, error) -> () in
            
            if error != nil {
                finished(array: nil)
                return
            }
            if let array = result!["statuses"] as? [[String : AnyObject]] {
                
                var list = [Status]()
                for item in array {
                    
                    let s = Status(dict: item)
                    list.append(s)
                }
                
                StatusListViewModel.cacheStatusImage(list, finished: finished)
            }
        }
    }
    
    private class func cacheStatusImage(array: [Status], finished: (array: [Status]?) -> ()) {
        
        if array.count == 0 {
            finished(array: array)
            return
        }
        
        let group = dispatch_group_create()
        
        for s in array {
            
            if let imageurls = s.pictureURLs {
                
                if imageurls.count != 1 {
                    continue
                }
                
                for url in imageurls {
                    
                    dispatch_group_enter(group)
                    SDWebImageManager.sharedManager().downloadImageWithURL(url, options: [], progress: nil, completed: { (_, _, _, _, _) -> Void in
                        
                        dispatch_group_leave(group)
                    })
                }
            }
        }
        
        dispatch_group_notify(group, dispatch_get_main_queue()) { () -> Void in
            
            finished(array: array)
        }
    }
}
